Improvement in machines for rolling chisels



G. PARR. Machine for Rolling Chisels.

No. 216,9 9.v Patented July 1, 1-879.

UNITED STATES PATENT OFFICE.

GEORGE FARR, or BUFFALO, NEW YORK, ASSIGNOR 'ro SARAH M. FARR,

OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR R OLLING CH ISELS.

Specification forming part of Letters Patent No. 2163639, dated July 1,1879 application filed September 6, 1878.

To all whom it may concern:

Be it known that I, GEORGE PARR, of the city of Buffalo, in the countyof Erie and State of New York, have invented new and useful Improvementsin Machines for Rolling Chisels, of which the' following is aspecification, reference being had to the accompanying drawlngs.

Chisels are ordinarily made by cutting a blank of suitable length from aflat bar of steel, then forging the tang or socket, as the case may be,on one end of the blank, and then drawing out the other end of the blankto the required tapering shape upon an anvil, either by hand or under atrip-hammer, and finally forming thebevel and cutting-edge on thechisel.

The object of my invention is to dispense with the manual labor indrawing out the blank and forming the bevel and cutting-edge on thechisel, whereby a tool' of high finish is produced. in a fraction of thetime ordinarily required and at much less expense.

My invention consists of the particular construction of a machinefordrawing out chisels by rolling and forming the cutting-edge at sametime, as will be hereinafter fully set forth.

In the accompanying drawings, Figure l is an elevation of my improvedmachine. Fig. 2

is a vertical section in line w as, Fig. 1. Fig.3 is a sectional view ofthe rollers in the position in which the drawing out of the chiselblankcommences. Fig. 4: is a, similar view, showing the rollers in' theposition in which the drawing out is finished and the end beveled. Fig.5 is a section in line y 3 Fig. 2, at right angles to that figure, on anenlarged scale. Fig. 6 is a horizontal section in line w w, Fig. 2.Fig.7 is a plan view of the lower roller. Fig. Sis a side elevationthereof.

Like letters of reference designate like parts in each of the figures.

A represents the bed-frame of the machine, and a the drivingvshaft,journaled in standards 13 B, supported on the bed-frame A. O is thedriving-pulley, and O the fly-wheel, mounted on the shaft to; and d, acounter-shaft, geared with the driving-shaft a by means of cog-wheels DD. E -F are the drawing-out rolls, mounted .-withthe upper die.

on horizontal shafts e f, which revolve in journal-boxes gg, arranged inthe vertical frames G G. The lower shaft, f, is connected with thecounter-shaftdby means of a sleeve-coup ling, h.

I is a gear-wheel, mounted 011 the lower shaft, f, and meshing with agear-wheel, I, secured to the upper shaft, 0, for driving the upperroll. Each roll is composed of an eccentric body or stock, E F, clampedbetween two circular heads, K K, by bolts 70. Those portions of theshafts of which pass through the rolls are made square or, if preferred,the shafts may be made round, and provided with suitable keys forsecuring the rolls'thereto.

l is amaledie, secured to the stock E of the upper roll; and m is afemale die, secured to the stock F of the lower roll, so as to registerThese dies are made in the form of circular segments, and of a lengthsuitable to produce a chisel of the desired length. The faces of thedies 1 m are farthest apart at their heads, or at the points where theyfirst seize the blank, as shown in Fig. 3, and gradually approach eachother according to the taper required for the particular kind of chiselto be produced. As shownin the drawings, the face of the upper die, l,is flat, while that of the lower die, m, is concave, whereby a chisel isproduced which is flat on one side and convex 011 the other.

It is obvious that the faces of the dies and their dimensions may bevaried in accordance with the diiferentkinds of chisels intended to bemade.

The dies lmare secured in dovetail grooves arranged in the stocks E F,either longitudinally or transversely, so as to be readily removablefrom the stocks when it is required to change the dies. The stocks E Fare also readily removed from the shafts when it is re quired toexchange them.

at is a beveled knife, arranged transversely at the rear end of thelower die, for forming the bevel at the end of the chisel and cuttingoff the rest of the blank from the finished chisel. The knife 42 isarranged in a trans verse groove formed inthe stock, and held in placeby any suitable means, so as to be readily removable.

( bling the operator to place the blank quickly in the proper position.

In operating the machine the rolls are r0 tated in the direction of thearrows. of suitable size and properly heated is seized with the tongs qand pushed through between the rolls when the depressed portions of thestocks E F are opposite each other. As the dies 1 m approach each othertheir front ends,

which are farthest apart, seize the blank, as shown in Fig. 3. The blankis now moved backward by the rolls, and at the same time is rolled outto the proper taper by the eccentrio form of the dies until the knife itcomes in contact with the drawn-out blank, when the bevel is formed onthe end of the chisel and the latter severed from the remaining portionof the blank. A chisel is formed in this man- A blank.

ner at every revolution of the rolls, without requiring any particularskill in the operator whereby the cost of production is greatly lessenedand a more uniform and better article is produced.

The tongs q are preferably provided with a projecting bar or stop, g,which strikes against the body of the roll when the blank has beenarranged in the proper place and prevents the further movement of thetongs.

I claim as my invention- In a machine for rolling chisels. thecombination, with the eccentric rolls E F, provided with segmental dies1 m, arranged in the largest portion of the rolls, and beveled cutter n,of the guide-bars 0 0, located between the r0 ls,

the whole being arranged to permit the intro duction of the chisel-blankfrom the same side on which the finished chisel is delivered,substantially as set forth.

enonen PARR.

Witnesses:

JNo. J. BONNER, GHAs. J. BUOHI-IEIT.

